Square-headed bolt



W. DAVIS & W. CASEY.

SQUARE HE-ADED BOLT.

' Patented Nov. 24,1885.

AF/755555, V

UNITED STATES PATENT UFFICE.

WILSON DAVIS AND WILLIAM CASEY, OF SOUTHINGTON, CONNECTICUT.

SQUARE-HEADED BOLT.

SPECIFICATION forming part of Letters Patent No. 330,962, dated November 241-, 1885.

Application filed June 11, 1885. Serial No. 168,357.

To all whom, it may concern:

Be it known that we, WILSON DAVIS and WILLIAM CASEY, both citizens of the United States, residing at Southington, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Making Square-Headed Bolts, of which the following is a specification.

Our invention relates to improvements in making square-headed bolts; and the objects of our invention are to make said bolts by less labor than heretofore and to make them with as thick heads as may be desired.

In the accompanying drawings, Figure 1 is a sectional View of the hammer portion of our heading-die. Fig. 2 is a like View of the anvil and holding portion of our said anvil. Fig. 3 is a side elevation of the blank from which our bolt is headed, and Fig. 4 is a side elevation of a bolt as it comes from the headingdies.

We have styled our invention as an improvement in making square-headed bolts, by which we wish to distinguish it from improvements in carriage-bolts which have a square neck just under a round head.

The style of bolts to which our improvement relates has a round body reaching up to the head, and the heads are generally square; but our improvement is equally applicable to making this style of bolts with a so-called six or eight square head, as well as the four-sided head shown in the drawings.

WVe make our bolt from round rods, which are preferably first cut into proper lengths, and then placed in a machine similar toan ordinary heading-machine for heading woodscrews or tire-bolts, and upset to form an enlargement between the two ends of the blank of the form shown in Fig. 3. This enlargement at one end is quite abrupt, and forms a shoulder, a, Fig. 3, while the opposite end should be of such form as to gradually diminish down to the original size of the rod or blank at its ends without forming any abrupt shoulder. That portion of the rod or blank which extends of uniform size from the shoulder a is the portion which in the headed bolt constitutes the body I) of the bolt. All of the metal on the other side of said shoulder is for forming the bolt-head. The blank, Fig. 3,

(No model.)

thus prepared is, when hot, placed between the ordinary holding-dies, A A, having semicircular grooves to receive the part which is to form the body of the bolt, and an anvilsurface at one end, upon which the head is made. The dies are then brought firmly together to hold the bolt, and the header or hammer portion B of the dies, having a matrix, c, of the form desired to give the bolthead, is forced upon said blank and forms the head at a single blow, changing the stock from the form shown in Fig. 3 into that shown in Fig. 4.

The position of the blank in place within the holding-dies and in front of the header B is represented in broken lines in Fig. 2. A small fin, d, Fig. 4, will be thrown out at the base of the head, which can be removed in any ordinary manner.

We consider it unnecessary to show means for forcing the respective dies together, as they are to be used in an ordinary bolt-heading machine.

Squarehead bolts have heretofore been made by means of dies similar to those shown in Figs. 1 and 2, but from straight rods or blanks. In such cases the heads had to be made quite thin, and the corners would not be full and sharp. If an attempt were made to get more stock in'the head by increasing the length of the projecting end of the stock when in the heading-dies, it was liable to bend sidewisethat is, double up or buckle-so that it would not form a solid head. In order to overcome this difficulty, this simple form of dies hasbeen abandoned, (except for very thin heads,) and machinery of quite a complicated character has been employed to make this class of bolts. By throwing that portion of the stock which is to form the head into the preliminary form shown in Fig. 3 and then which was to form the square neck under the head, and that said enlarged portion was squared by being subjected to lateral pressure between dies, after which a head was formed over the square neck by endwise pressure on the rod, the entire portion which was formed into the head of the bolt being of the same size as the bolt-body. All of said prior art is hereby disclaimed.

We claim as our invention That improvement in the art of making square-head bolts from a round rod which consists in first enlarging the base of that portion which is to form the bo1t-head while its upper end is of the size of the original rod, and then forming the head in a suitable matrix by endwise pressure upon the prepared rod, substantially as described, and for the purpose specified. 4

WILSON DAVIS. WILLIAM CASEY.

Witnesses: V

W. E. STANNARD,

WV. T. FOLEY. 

